DIY wooden astronomical telescope assembly model, "no nails, no glue, hand assemble a small telescope that can truly observe stars". Wooden parts: Laser cut oak plywood, free of burrs, emitting a light woody aroma. A "mini equatorial instrument" that can pitch up and down 30 degrees and rotate horizontally 360 degrees. Gear type focusing seat, the child can adjust the clarity by rotating the small side wheel. Zero tool assembly: mortise and tenon joint+rubber band lock buckle, can be disassembled and reassembled repeatedly. Educational value: Physics: Refraction imaging, focal length and magnification calculation. Engineering: Understanding mortise and tenon joints, levers, and gear transmission.